Dihydrodibenzo(b,f)azepine derivatives

ABSTRACT

NEW 10,11-DIHYDRODIBENZO (B,F)AZEPINES OF THE FORMULA:   5-R,10-(R1-OOC-NH-)-10,11-DIHYDRO-5H-DIBENZ(B,F)AZEPINE   WHEREIN R REPRESENTS HYDROGEN OR ALKYL OF 1 THROUGH 5 CARBON ATOMS, AND R1 REPRESENTS ALKYL OF 1 THROUGH 7 CARBON ATOMS, ARE USEFUL FUNGICIDES.

United States Patent 3,792,042 DIHYDRODIBENZO[b,f]AZEPINE DERIVATIVES Jean Fouch, Bourg-la-Reine, and Andr Leger, Massy, France, assignors to Rhone-Poulenc S.A., Paris, France No Drawing. Filed June 22, 1970, Ser. No. 48,450 Claims priority, application France, June 24, 1969, 6921176; Apr. 9, 1970, 7012838 Int. Cl. C07d 41/08 US. Cl. 260-239 D 8 Claims ABSTRACT OF THE DISCLOSURE New 10,11-dihydrodibenzo[b,f] azepines of the forwherein R represents hydrogen or alkyl of 1 through carbon atoms, and R represents alkyl of 1 through 7 carbon atoms, are useful fungicides.

This invention relates to new 10,1l-dihydrodibenzoazepine derivatives, to a process for their preparation, and compositions containing them.

The 10,11-dihydrodibenzo b,f] azepine derivatives of the present invention are those of the general formula:

of General Formula I are prepared by the process which comprises reacting a chloroformate of the general formula:

CICOOR (II) (wherein R is as hereinbefore defined) with a 10-amino- 10,1l-dihydrodibenzo[b,f]azepine of the general formula:

wherein R is as hereinbefore defined.

The reaction is generally carried out in an anhydrous medium, at a temperature between 25 and +25 0., either in an inert organic solvent such as an aromatic hy- (III) drocarbon (e.g. benzene or toluene), a chlorinated hydro carbon (e.g. chloroform or dichloroethane), an ether (e.g. diethyl ether, diisopropyl ether, tetrahydrofuran or dioxan), or an amide (e.g. dimethylformamide), and in the presence of an inorganic base, preferably an alkali metal carbonate or bicarbonate, or an organic base such as triethylamine, or in a basic solvent such as pyridine. The process is advantageously carried out either in anhydrous benzene in the presence of triethylamine or simply in anhydrous pyridine.

In the case where the symbol R in Formula III rep- 3,792,042 Patented Feb. 12, 1974 resents a hydrogen atom, only the NH grouping reacts under the reaction conditions and it is not necessary to protect the -NH- grouping of the ring.

The starting materials of General Formula III can be prepared by reduction of an oxime of the general formula: i

-OH (IV) (wherein R is as hereinbefore defined) by the action of sodium in a saturated primary aliphatic alcohol containing 2 to 6 carbon atoms, for example butanol, or by the action of sodium amalgam.

The compounds of General Formula IV can be prepared from the corresponding ketones of the general formula:

wherein R is as hereinbefore defined, by application of any known method for the preparation of oximes from ketones.

The ketones of General Formula V wherein R represents an alkyl radical can be prepared in accordance with the method described in the specification of British Pat. No. 961,444, entitled Dibenz[b,f]Azepin Derivatives and Processes for the Preparation Thereof granted to J. R. Geigy A.G. on an application filed Nov. 16, 1960 by alkylation of 10-methoxydibenzo [b,f]azepine of the formula:

0 OH: by reaction with a compound of the general formula:

wherein R represents a straightor branched-chain alkyl radical containing 1 to 5 carbon atoms, and X represents the acid residue of a reactive ester (e.g. a halogen atom), followed by hydrolysis of the resulting intermediate product of the formula:

OCH;

wherein R is as hereinbefore defined.

The 10,1l-dihydrodibenzoazepine derivatives obtained by the aforesaid process may optionally be purified by physical methods such as crystallization or chromatography.

The dihydrodibenzoazepine derivatives of General Formula I posses valuable fungicidal properties; they are particularly active against cucumber mildew (Erysiphe polyphage), against flax mildew (Erysiphe lz'm'), against apple mildew (Podosphaera leucotricha), against rosebush mildew (Sphaerathica pannosa) and against ma- (VII) honia mildew (Microsphaera berberidis). Preferred compounds are those in which R represents a hydrogen atom or a methyl, ethyl or propyl radical, and R represents a straight-chain alkyl radical containing 3 to 6 carbon atoms and in particular -methyl-1o-propoxycanbonylamino-l0,1 l-dihydrodibenzo[b,f] azepine,

S-methyl-lO-butoxycarbonylamino-10,1l-dihydrodibenzo[b,f] azepine,

10-hexyloxycarbonylamino-10,1 l-dihydrodibenzo[b,f] azepine,

10-propoxycarbonylamino-10,1l-dihydrodibenzo[b,f] azepine,

10-butoxycarbonylamino-10,1 l-dihydrodibenzo- [b,f] azepine, and

10-pentyloxycarbonylamino-10,1 l-dihydrodibenzo- [b,f] azepine.

The present invention also includes within its scope fungicidal compositions which contain, as the active ingredient, at least one 10,11-dihydrodibenzoazepine derivative of General Formula I in association with one or more diluents or adjuvants compatible with the compound(s) and suitable for use in agriculture. Preferably the comopsitions contain between 80 and 0.005% by weight of active compound.

The compositions may be solid if there is employed a powdered solid compatible diluent such as talc, calcined magnesia, kieselguhr, tricalcium phosphate, powdered cork, adsorbent charcoal, or a clay such as kaolin or bentonite. These solid compositions are preferably prepared by grinding the active compound with the solid diluent, or by impregnating the solid diluent with a solution of the compound in a volatile solvent, evaporating the solvent, and if necessary grinding the product so as to obtain a powder.

Instead of a solid diluent, there may also be used a liquid in which the active compound is dissolved or dispersed. The compositions may thus take the form of suspensions, emulsions or solutions in organic or aqueousorganic media, for example acetophenone, aromatic hydrocarbons such as toluene or xylene, or mineral, animal or vegetable oils, or mixtures of these diluents. The compositions in the form of suspensions, emulsions or solutions may contain wetting, dispersing or emulsifying agents of the ionic or non-ionic type, for example sulphoricinoleates, quaternary ammonium derivatives or products based on ethylene oxide condensates, such as condensates of ethyl ene oxide with octylphenol, or fatty acid esters of anhyrosorbitols which have been rendered soluble by ethcrification of the free hydroxyl radicals by condensation with ethylene oixde. It is preferable to use agents of the nonionic type because they are not sensitive to electrolytes. When emulsions are required, the compound may be used in the form of self-emulsifying concentrates containing the active substance dissolved in the emulsifying agent or in a solvent containing an emulsifying agent compatible with the compound and solvent, a simple addition of water to such concentrates producing compositions ready for use.

These compositions, which can be solid or liquid, optionally contain one or more other pesticides, such as insecticides or fungicides, compatible with the compounds of General Formula I and with the diluent or adjuvant.

The new dihydrodibenzoazepine derivatives of General Formula I are preferably employed as fungicides in a quantity of 25 to 75 g. of active compound per hectolitre of water. In the field the compounds can be applied at the rate of 25 to 75 g. per hectare.

The following examples illustrate the invention.

EXAMPLE 1 Ethyl chloroformate (5.7 g.) is added to a solution of 5- methyl-10-amino-10,1l-dihydrodibenzo[b,f]azepine 11.2 g.) in anhyrous pyridine (100 cc.), the temperature being maintained at -20 C. The reaction mixture is kept at -20 C. for 1 hour and then at 20 C. for 1 hour. The mixture is then taken up in distilled water (700 cc.) and twice extracted with diethyl ether (total 200 cc.). The ethereal solution is successively washed with distilled water (100 cc.), twice with 5 N hydrochloric acid (total 100 cc.) and three times with distilled water (total 300 cc.). The ethereal solution is dried over anhydrous sodium sulphate and evaporate. The residue (13.1 g.) is dissolved in boiling diisopropyl ether (25 cc.). After cooling at 20 C. for 3 hours, the crystals which have formed are filtered off, twice washed with ice-cold diisopropyl ether (20 cc.) and dried under reduced pressure (20 mm. Hg). S-methyl- 10-ethoxycarbonylamino-10,11 dihydrodibenzo[b,f]azepine (11.6 g.), melting at C., is obtained.

5-methyl-10-amino-l0,l1 dihydrodibenzo[b,f]azepine employed as starting material can be obtained as follows:

5-methyl-10-oxo 10,11 dihydrodibenzo[b,f]azepine, melting at 104 C. is prepared in accordance with British Pat. No. 961,444;

S-methyl-IO-hydroxyimino-10,11 dihydrodibenzo[b,f] azepine (53.5 g.), melting at 196 C., is prepared by reaction of an excess of hydroxylamine with 5-methyl-10-oxo- 10,1l-dihydrodibenzo[b,f]azepine (60 g.) in an aqueous methanol medium under reflux;

5-methyl-10-amino-10,l1 dihydrodibenzo [b,f]azepine (11.5 g.) melting at 96 C., is prepared by reduction of 5- methyl-10-hydroxyimino-10,11 dihydrodibenzo[b,f]azepine (10 g.) by means of sodium (13 g.) in butanol at 100 C.

EXAMPLE 2 A solution of methyl chloroformate (2.95 g.) in anhydrous benzene (20 cc.) is added at about 20 C. to a solution of 5-rnethyl-10-amino-10,11-dihydrodibenzo[b,f]azepine (7.0 g.) and triethylamine (3.16 g.) in anhydrous benzene (70 cc.). The reaction mixture is left at 20 C. for about 20 hours and is then taken up in distilled water (100 cc.) and diethyl ether (100 cc.). Insoluble matter (0.3 g.), melting at 260 C., is filtered off. The organic solution is washed with distilled water (100 cc.), twice with 2 N methanesulphonic acid (total 50 cc.), and three times with distilled water (total 150 cc.), dried over anhydrous magnesium sulphate and then evaporated. The residue (7.8 g.) is taken up in diethyl ether (100 cc.) and a further amount of insoluble matter (0.5 g.), melting at 260 C., is filtered off. After evaporations of the filtrate the residue (7.1 g.) is dissolved in boiling diisopropyl ether (50 cc.). After cooling at 20 C. for 17 hours, the crystals which have formed are filtered off, washed three times with diisopropyl ether (total 15 cc.) and dried under reduced pressure (20 mm. Hg). The resulting product (6.5 g.), melting at 108-110 C. is recrystallized from methanol (25 cc.) to yield 5-methyl-10-methoxycarbonylamino-10, fibdihcydrodibenzo[b,f]azepine (4.5 g.) melting at 118- EXAMPLE 3 A solution of ethyl chloroformate (5.4 g.) in anhydrous benzene (30 cc.) is added at 3 C., over a period of 30 minutes, to a solution of 10-amino-l0,ll-dihydrodibenzo [b,f]azepine (10.5 g.) and triethylamine (5.0 g.) in anhydrous benzene (150 cc.). The reaction mixture is left for about 4 hours at 20 C. and is then treated with distilled water (150 cc.), 2 N sodium hydroxide solution (25 cc.) methylene chloride (100 cc.) and diethyl ether (100 cc.). Insoluble matter (2.5 g.), melting at 200 C., is filtered off. The organic solution is washed three times with distilled water (total 150 cc.), twice with 2 N methanesulphonic acid (total 150 cc.), twice with a 5% (w./v.) sodium bicarbonate solution (total 50 cc.), and then five times with distilled water (total cc.). The organic solution is dried over anhydrous sodium sulphate and then evaporated. The residue (10.5 g.) is taken up in diethyl ether cc.); an insoluble material (1.1 g.), melting at 195 C., is filtered off. The filtrate is evaporated. The residue (8.6 g.) is dissolved in a 15:85 (parts) by volume mixture of ethyl acetate and cyclohexane (280 cc.), and the resulting solution i chromatographed through a 0.2- 0.5 mm. silica gel column (silica: 50 g.; column diameter: 18 mm.). Elution with the same solvent yields a first fraction of 300 cc. which is discarded, and then a second fraction of 300 cc.; concentration of this second fraction yields 10 ethoxycarbonylamino-IO,11-dihydrodibenzo[b,f]azepine (6.4 g.) in the form of an oil.

Analysis.-Calculated (percent): N, 9.92. Found (percent): N, 9.6-9.7.

10 amino-10,1l-dihydrodibenzo[b,f]azepine employed as starting material can be obtained a follows:

l-methoxy-dibenzo [b,f]azepine (melting at 125 C.) is prepared in accordance with the method described in the specification of British Pat. No. 943,277 entitled Dibenz [b,f]Azepines and Process for Their Preparation granted to J. R. Geigy A. G. on an application filed Nov. 16, 1960.

-oxo-l0,l1-dihydrodibenzo[b,f]azepine (8.1 g.), melting at 141 C., is prepared by the action of dilute hydrochloric acid on 10-methoxy-dibenzo[b,f]azepine (14.0 g.).

10 hydroxyimino 10,11-dihydrodibenzo[b,f] azepine (6.1 g.), melting at 168 C., is prepared by reaction of an excess of hydroxylamine with 10-oxo-10,11-dihydrodibenzo[b,f]azepine (8 g.) in aqueous ethanol under reflux;

10-amino-10,1l-dihydrodibenzo[b,f]azepine (2.4 g.), melting at 123 C. is prepared by reaction of sodium amalgam (205 g.), containing 2.5% by weight of sodium, with 10 hydroxyimino-10,11-dihydrodibenzo[b,f]azepine (6.1 g.) in ethanol.

EXAMPLE 4 Propyl chloroformate (4.5 g.) is added to a solution of 5-methy110-amino-10,1l-dihydrodibenzo[b,f]azepine (7.8 g.) in anhydrous pyridine (70 cc.) the temperature being maintained at 20 C. The reaction mixture is kept at 20 C. for 1 hour and then at 2 C. for 1 hour, and is then taken up in distilled water (500 cc.) and twice extracted With diethyl ether (total 300 cc.). The ethereal solution is successively washed three times with 2 N hydrochloric acid (total 300 cc.) and then twice with distilled water (total 200 cc.). The ethereal solution is treated with vegetable charcoal (0.4 g.), dried over anhydrous sodium sulphate and evaporated. The residue (9.8 g.) is dissolved in ethanol (40 cc.) at about 40 C., and distilled water (40 cc.) is then gradually added to the solution obtained. After standing for 4 hours at 25 C. followed by 16 hours at 2 C., the crystals which have formed are filtered off, washed with a mixture of ethanol and water (1:1 by volume; cc.), and dried under reduced pressure mm. Hg) to yield S-methyl-lO-propoxycarbonylarnino-10,11-dihydrodibenzo[b,f] azepine (8.0 g.) melting at 7072 C. (instantaneous melting).

EXAMPLE 5 Isopropyl chloroformate (3.3 g.) is added to a solution of 5 methyl-10-amino-10,1l-dihydrodibenzo[b,f]azepine (5.6 g.) in anhydrous pyridine (50 cc.), the temperature being kept at 20 C. The reaction mixture is kept at 20 C. for 1 hour, and then taken up in distilled water (400 cc.) and extracted three times with diethyl ether (total 150 cc.). The ethereal solution is successively washed three times with distilled water (total 150 cc.), three times with N hydrochloric acid (total 150 cc.), and five times with distilled water (total 150 cc.), and is then dried over anhydrous sodium sulphate and evaporated. The residue (6.1 g.) is dissolved in boiling diisopropyl ether (20 cc.). After standing for 16 hours at 2 C., the crystals which have formed are filtered 01f, washed with ice-cold diisopropyl ether (8 cc.) and then twice with petroleum 'ether (boiling point 40-65 C.; total 20 cc.), and dried under reduced pressure (20 mm. Hg). S-methyll0 isopropoxycarbonylamino-10,11-dihydrodibenzo[b,f] azepine (5.1 g.), melting at 91 C., is thus obtained.

6 EXAMPLE 6 Butyl chloroformate (5.0 g.) is added to a solution of 5 methyl 10 amino-10,11-dihydrodibenzo [b,f]azepine (7.8 g.) in anhydrous pyridine (70 cc.), the temperature being kept at 20 C. The reaction mixture is kept at 20 C. for 1 hour and then at 2 C. for 1 hour. The reaction mixture is then taken up in distilled water (500 cc.) and extracted three times with diethyl ether (total 210 cc.). The ethereal solution is successively washed three times with distilled water (total 150 cc.), twice with 2 N hydrochloric acid (total cc.), and four times with distilled water (total 200 cc.). The ethereal solution is treated with vegetable charcoal (0.1 g.), dried over anhydrous sodium sulphate and evaporated. The residue (10.6 g.) is dissolved in boiling petroleum ether (boiling point 40-65 C.; 30 cc.). After standing for 3 hours at 2 C., the crystals which have formed are filtered or, washed twice with ice-cold petroleum ether (boiling point 4065 C.; total 20 cc.), and dried under reduced pressure 20 mm. Hg) to yield 5-methyl-10-butoxycarbonylamino- 10,11-dihydrodibenzo[b,f]azepine (10.1 g.) melting at 77 C.

EXAMPLE 7 Isobutyl chloroformate (5.0 g.) is added to a solution of 5 methyl 10 amino-10,11-dihydrodibenzo[b,f] azepine (7.8 g.) in anhydrous pyridine (70 cc.), the temperature being kept at 20 C. The reaction mixture is kept at 20 C. for 1 hour and then at 2 C. for 1 hour. The reaction mixture is then taken up in distilled water (500 cc.) and extracted three times with diethyl ether (total cc.). The ethereal solution is successively washed three times with distilled water (total 150 cc.), twice with 2 N hydrochloric acid (total 100 cc.) and three times with distilled water (total 300 cc.). The ethereal solution is dried over sodium sulphate and evaporated. The residue (10.5 g.) is dissolved in boiling ethanol (30 cc.), and distilled water (25 cc.) is then gradually added to the resulting solution. After standing for 2 hours at 2 C., the crystals which have formed are filtered off, washed with a mixture of ethanol and water (1:1 by volume; 20 cc.) and dried under reduced pressure (20 mm. Hg) to yield 5 methyl 10 isobutoxycarbonylamino 10,11 dihydrodibenzo[b,f] azepine (9.9 g.) melting at 86 C.

EXAMPLE 8 Ethyl chloroforrnate (2.9 cc.) is added at --20 C. to a solution of 5 ethyl 10 amino-10,11-dihydrodibenzo[b,f] azepine (6.5 g.) in anhydrous pyridine (60 cc.) over the course of 10 minutes. The resulting suspension is stirred at 20 C. for 1 hour and then at 2 C. for 1 hour 30 minutes. The reaction mixture is poured into icewater (600 cc.). The oil which separates is twice extracted with diethyl ether (total 300 cc.). The combined ethereal solutions are twice washed with distilled water (total 300 cc.), then twice with N hydrochloric acid (total 300 cc.) and finally with a 2% (w./v.) solution of sodium bicarbonate (150 cc.). The ethereal solution is dried over anhydrous magnesium sulphate and concentrated. The residue (7.4 g.) is distilled under reduced pressure to yield 5-ethyl-10-ethoxycarbonylamino-10,11- dihydrodibenzo[b,f]azepine (5.7 g.), B.P. 192194 C./ 0.9 mm. Hg.

5 ethyl 10 amino-10,1l-dihydrodibenzo[b,f]azepine employed as starting material can be obtained as follows:

10 methoxy-dibenzo[b,f]azepine is prepared as indicated in Example 3.

5 ethyl 10 methoxy-dibenzo[b,f]azepine (15.4 g.), melting at C., is prepared by the action of sodium amide followed [by ethyl iodide, in hexamethylphosphotriamide, on 10-methoxy-dibenzo[b,f]azepine (20 g.).

5 ethyl 10 oxo-10,11-dihydrodibenzo[b,f]azepine (10.7 g.), melting at 120 C., is prepared by the action of dilute hydrochloric acid on 5-ethyl-10-methoxy-dibenzo[b,f]azepine (12.7 g.).

5 ethyl 10 hydroxyimino-10,1l-dihydrodibenzo- [b,f]azepine (10.8 g.), melting at 207 C., is prepared by reaction of an excess of hydroxylamine with 5-ethyl- 10-oxo-l0,11 dihydrodibenzo[b,f]azepine (10.5 g.).

5 ethyl 10 amino 10,1l-dihydrodibenzo[b,f]- azepine (6.7 g.), melting at 89 C., is prepared by reaction of sodium, with 5-ethyl-10-hydroxyimino-10,1l-dihydrodibenzo[b,f]azepine (10 g.) in ethanol.

EXAMPLE 9 Following the procedure described in Example 8 but reacting S-methyl 10 amino-10,11-dihydrodibenzo[b,f] azepine (6.7 g.) and heptyl chloroformate (5.7 g.) in anhydrous pyridine (60 cc.), S-methyl 10 heptyloxycarbonylamino-10,11 dihydrodibenzo[b,f]azepine (8.6 g.), melting at 78 C., is obtained.

5-methyl-l0-amino-10,11 dihydrodibenzo[b,f]azepine employed as starting material can be obtained as indicated in Example 1.

EXAMPLE 10 Following the procedure described in Example 8 but reacting 5-propyl-10-amino 10,11 dihydrodibenzo[b,f] azepine (5.9 g.) and ethyl chloroformate (2.7 g.) in anhydrous pyridine -(65 cc.), 5 propyl-10'ethoxycarbonylamino-10,11 dihydrodibenzo[b,f]azepine (5.1 g.) is obtained.

Analysis-Calculated (percent): N, 8.63. Found (percent): N, 8.4.

5-propyl-10-amino 10,11 dihydrobenzo[b,f]azepine employed as starting material can be obtained as follows:

10 methoxy dibenzo[b,f]azepine is prepared as indicated in Example 3.

5-propyl 10 methoxy-dibenzo[b,f]azepine 18 g.), melting at 100 C., is prepared by the action of sodium amide followed by propyl bromide on l-methoxy-dibenzo[b,f]azepine (20 g.) in a mixture of toluene and hexamethylphosphotriamide (10:1 by volume) at 90- 100 C.

-propyl oxo-10,11-dihydrodibenzo[b,f]azepine (16.7 g.), melting at 60-62 C. is prepared by the action of 2 N hydrochloric acid on 5-propyl 10 methoxydibenzo[b,f]azepine (18 g.) under reflux for 1% hours.

5-propyl 10 hydroxyimino 10,11 dihydrodibenzo [b,f]azepine (17.2 g.), melting at 100 C., is prepared by the action of hydroxylamine hydrochloride (9.25 g.) and sodium acetate trihydrate (18.1 g.) on 5-propyl-10-oxo- 10,1l-dihydrodibenzo[b,f]azepine (16.7 g.) in a mixture of ethanol and water (3:1 by volume) under reflux for 5 hours.

5-propyl 10-amino-10,11-dihydrodibenzo[b,f]azepine, the fumarate of which melts at 212215 C., is prepared by reduction of 5-propyl-10-hydroxyimino-10,1l-dihydrodibenzo[b,f]azepine by means of sodium in butanol at 100 C.

EXAMPLE 11 Hexyl chloroformate (5.25 g.) is added over the course of 5 minutes, at '20 C., to a solution of 10-amino-10,11- dihydrodibenzo[b,f]azepine (6.3 g.) in anhydrous pyridine (60 cc.). The resulting suspension is stirred for 2 hours at C. and then for 2 hours at +2 C. The reaction mixture is poured into distilled water (500 cc.). The oil which separates is extracted three times with diethyl ether (total 450 cc.). The combined ethereal solutions are twice washed with N hydrochloric acid (total 300 cc.) and then twice with distilled water (total 200 cc.). The ethereal solution is dried over anhydrous magnesium sulphate and concentrated. The residue (8.3 g.) is dissolved in cyclohexane (800 cc.) and the resulting solution is chromatographed on silica (85 g.; column diameter 2.3 cm.). Elution is carried out with a mixture of cyclohexane and ethyl acetate (9:1 by volume). After concentrating Following the procedure described in Example 11 but reacting 10-amino-10,ll-dihydrodibenzo [b,f]azepine (6.3 g.) and methyl chloroformate (3.0 g.) in anhydrous pyridine (60 cc.), 10-methoxycarbonylamino-10,11-dihydrodibenzo[b,f]azepine (4.0 g.) is obtained.

Analysis.-Calculated (percent): C, 71.62; H, 6.01; N, 10.44. Found (percent): C, 70.6; H, 6.1; N, 9.7.

EXAMPLE 13 Following the procedure described in Example 11 but reacting 10-amino-10,1l-dihydrodibenzo[b,f]azepine (6.3 g.) and propyl chloroformate (3.7 g.) in anhydrous pyridine (60 cc.), lO-propoxycarbonylamino-10,1l-dihydrodibenzo[b,f]azepine (6.8 g.) is obtained.

Analysis.-Calculated (percent): C, 72.96; H, 6.80; N, 9.44. Found (percent): C, 72.8; H, 6.7; N, 9.0.

EXAMPLE 14 Following the procedure described in Example 11 but reacting 10-amino-10,1l-dihydrodibenz[b,f]azepine (6.3 g.) and butyl chlorformate (4.4 g.) in anhydrous pyridine (60 cc.), IO-butoxycarbonylamino-10,1l-dihydrodibenzo- [b,f] azepine (8.0 g.) is obtained.

Analysis.Calculated (percent): C, 73.52; H, 7.14; N, 9.02. Found (percent): C, 73.2; H, 7.1; N, 8.6.

EXAMPLE 15 Following the procedure described in Example 11 but reacting 10 amino 10,11 dihydrodibenzo[b,f]azepine (6.3 g.) and pentyl chloroformate (4.8 g.) in anhydrous pyridine (60 cc.), 10 pentyloxycarbonylamino 10,11- dihydrodibenzo[b,f]azepine (7.5 g.) is obtained.

Analysis.Calculated (percent): C, 74.05; H, 7.46; N, 8.63. Found (percent): C, 73.8; H, 7.7; N, 8.2.

EXAMPLE 16 Following the procedure described in Example 11 but reacting 10-amino-10,1l-dihydrodibenzo[b,f]azepine (6.3 g.) and isopropyl chloroformate (4.1 g.) in anhydrous pyridine (60 cc.), 10-isopropoxycarbonylamino-10,11- dihydrodibenzo[b,f]azepine (5.5 g.), melting at 106 C., is obtained.

EXAMPLE 17 Following the procedure described in Example 11 but reacting l0amino-l0,11-dihydrodibenzo[b,f]azepine (6.7 g.) and isobutyl chloroformate (4.5 g.) in anhydrous pyridine (60 cc.), 10-isobutoxycarbonylamino-l0,1l-dihydrodibenzo[b,f]azepine (9.1 g.) is obtained.

Analysis.Calculated (percent): C, 73.52; I-I, 7.14; N, 9.03. Found (percent): C, 73.8; H, 7.4; N, 8.9.

EXAMPLE 18 Sodium lignosulphite (25 g.), kaolin (470 g.) and Tween (5 g.) [Tween is a registered trademark] are added to 5-methyl-l0 ethoxycarbonylamino 10,11- dihydrodibenzo[b,f]azepine (500 g.). After grinding and sieving, the resulting powder is used, after dilution with water in the ratio of g. of powder per 100 litres of water, to protect plants against attacks by mildew.

9 We claim: 1. 10,11-dihydrodibenzo[b,f]azepine derivatives of the formula:

NH-C 00R:

wherein R represents hydrogen or alkyl of 1 through 5 carbon atoms, and R represents alkyl of 1 through 7 carbon atoms.

2. 10,11 dihydrodibenzo[b,f]azepine derivatives according to claim 1 wherein R represents hydrogen, methyl, ethyl or propyl, and R represents straight-chain alkyl of 3 through 6 carbon atoms.

3. The 10,11-dihydrodibenzo [b,f] azepine derivative according to claim 1 which is S-methyl-l0-propoxycarbonylamino-10,1 l-dihydrodibenzo [b,f] azepine.

4. The 10,11-dihydrodibenzo [b,f] azepine derivative ac- 10 cording to claim 1 which is 5-methyl-IO-butoxycarbonylamino-10,1 l-dihydrodibenzo [b,f] azepine.

5. The 10,11-dihydrodibenzo[b,f] azepine derivative according to claim 1 which is IO-hexyloxycarbonylamino- 10,1 l-dihydrodibenzo [b,f] azepine.

6. The 10,11-dihydrodibenzo[b,f]azepine derivative according to claim 1 which is IO-propoxycarbonylamino- 10,1 l-dihydrodibenzo [b,f] azepine.

7. The 10,11-dihydrodibenzo[b,f] azepine derivative according to claim 1 which is 10-butoxycarbonylamino- 10,1 l-dihydrodibenzo [b,f] azepine.

8. The 10,11-dihydrodibenzo[b,f] azepine derivative according to claim 1 which is 10-pentyloxycarbony1amino- 10,1 1-dihydr0dibenzo[b,f]azepine.

References Cited UNITED STATES PATENTS 3,622,565 11/1971 Fouche et a1. 260-239 D ALTON D. ROLLINS, Primary Examiner US. Cl. X.R. 424-244 

